Andrew prader



(No Model.)

. A. PRADER.

TREADLE ATTACHMENT.

No. 514,272. Patented Feb. 6,1894

15 I Hmmu; I

INVE OH JZM ATTORNEYS NITED STATES PATENT OFFICE.

ANDREW PRADER, OF SPOKANE, WASHINGTON, ASSIGNOR OF ONE-FOURTH TO JOSEPHD. I-IORWITZ, OF SAME PLACE.

TREADLE ATTACHMENT.

, SPECIFICATION forming part of Letters Patent No. 514,272, datedFebruary 6, 1894.

Application filed April 10, 1893- To (ZZZ whom it may concern.-

Be it known that I, ANDREW PRADER, of Spokane, in the county of Spokaneand State of Washington, have invented a new and Improved TreadleAttachment, of which the following is a full, clear, and exactdescription. The invention relates to machines, such as sewing machines,&c., actuated by foot power.

-The object of the invention is to provide a new and improved treadleattachment, which is simple and durable in construction, very effectivein operation, and arranged to prevent dead center positions, so that thedriven shaft is rotated in a forward direction on starting the treadle.The invention consists of certain parts and details, and combinations ofthe same, as will be hereinafter described and then pointed out in theclaim.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side elevation of the improvement as applied. Fig. 2 is arear elevation of the same. Fig. 3 is an enlarged rear elevation of thespring clamp. Fig. 4 is an enlarged sectional plan View of .part of theimprovement on the line 4=4 of Fig. 2.

On the frame A of the machine to be actuated is arranged the usualtreadle B, connected by the pitman O with a wrist pin D held on thewheel or crank arm secured on the shaft E to be driven. In order toprevent the wrist pin D from assuming a dead center position relative tothe treadle B, I provide a spring F held at its lower end in asocket G,of a clamp G adapted to be fastened to the treadle B, the said clampbeing provided for this purpose with a foot G and a set screw Grengaging the treadle on the top and bottom respectively, near thepivotal connection Serial No. 469.765. (No model.)

of the pitman C with the treadle. A set screw 11 screws in the socket Gto secure the fiat spring F in place. The upper end of the flat springengages loosely a slot in a pivot I mounted to turn in a clamp J,secured by a set screw K to the pitman 0 near the upper end of the same,as is illustrated in the drawings. Now, it will be seen that the flatspring F exerts a pressure against the upper end of the pitman C andconsequently on the wrist pin D, so as to hold the same out of a deadcenter position relative to the treadle B, thereby enabling the operatorto start the shaft E forward whenever the treadle B is pressed.

As illustrated in Fig. 1, the flat spring F is adjusted in the socket Gand connected with the clamp J in such a manner that the pressure of thespring on the wrist pin D is rearward in a direction approximatelyparallel with the treadle B, so that either a lower or a top position ofthe wrist pin is prevented whenever the machine is stopped.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent A treadle attachment comprising a straightplate spring F, a pitmanclamp J having a slotted pivot pin I throughwhich the upper end of the spring passes and a treadle clamp G, having alateral lug G2 a clamping screw G to receive the rear edge of thetreadle between them a vertically extending socket G through which thelower end of the spring passes and a set screw H extending transverselythrough the socket against the spring, substantially as set forth.

ANDREW PRADER.

